Relation of structural damage to exposure time and intensity in acoustic trauma.
Relation of structural damage to exposure time and intensity in acoustic trauma.
复制标题
声损伤中结构损伤与暴露时间和强度的关系。
作者：
H. Spoendlin;J. Brun
为了克服难以获得整个耳蜗的调查评估以及对同一耳的选定区域进行超微结构检查的困难，我们采用了一种新技术，将表面制备和EM研究结合起来，而不会因机械制备而造成损伤。暴露强度从100到140分贝不等，暴露时间从30秒到一周不等。得到了不同强度下暴露时间与损伤程度或损伤类型、暴露强度与损伤类型的关系。在120 ~ 130 dB以上的暴露强度下，直接结构损伤有规律地、不同程度地发生，主要取决于暴露强度，而在较低的暴露强度下，以延迟现象为主，主要取决于暴露时间。
In order to overcome the difficulty to obtain a survey evaluation of the entire cochlea as well as an ultrastructural examination of selected areas of the same ear, we used a new technique for combined surface preparations and EM studies without the risk of damage by mechanical preparation. Exposure intensities were varied from 100 to 140 dB and exposure times from 30 sec to one week. The relations between exposure time and extent or type of damage on one hand and between exposure intensity and damage on the other hand were worked out at different intensity levels. Above 120–130 dB exposure intensity, direct immediate structural damage occurs regularly in various degrees, depending mainly on exposure intensity, whereas in lower intensities delayed phenomena are predominant, depending mainly on exposure time.